Which exoplanet detection method requires us to be in the same plane as the exoplanetary system?
A. Direct imaging
B. Transit method
C. Radial-velocity method
D. Gravitational lensing
E. None of these choices are correct.
Answer: B
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A beam of singly-charged ions entering a magnetic field are swept into circular paths. The wider paths are those of
A) the lighter ions. B) the heavier ions. C) neither particularly.
A charged particle (mass = M, charge = Q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed V?
a. QVB toward the east b. Zero c. QVB toward the west d. QVB upward e. QVB toward the south
An electron is in an infinite square well (a box) that is 8.9 nm wide. What is the ground state energy of the electron? (h = 6.626 × 10-34 J ? s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19)
A) 0.0048 eV B) 0.0057 eV C) 0.0066 eV D) 0.0076 eV E) 0.0085 eV
A 12-V battery is connected across a 100-? resistor. How many electrons flow through the wire in 1.0 min? (e = 1.60 × 10-19 C)
A) 1.5 × 1019 B) 2.5 × 1019 C) 3.5 × 1019 D) 4.5 × 1019